Reliable adhesion: strong adhesion to paper, with self-adhesive and re-adhesive capabilities. Easy to install and remove without leaving any residue. Note: tear off straight from the sticky side, do not bend 180 degrees. Will not roll up or affect stickiness. Black self-adhesive sticky notes: 1 pack, 19 x 19 cm, 50 sheets per pad. The black color provides high visibility and pairs well with gel pens for crisp writing. Advantages at a glance: - High-contrast writing surface that works smoothly with gel pens - Large 19 x 19 cm sheets offer ample space for notes, reminders, or markings - Reusable-friendly adhesion that grips paper yet cleans up cleanly What this helps you do: - Mark important pages and sections in books, planners, or manuals - Create visible reminders on calendars, whiteboards, or desks - Label files, folders, or binders for quick identification Customer support: - 24-hour online manual service. If you have questions, contact us and we will provide a satisfactory response.